Internal-combustion motor with slide-valve action



F. J. HOLDER AND H STEWART]. INTERNAL COMBUSTION MOTOR WITH SLIDE VALVEACTION. APPLICATION FILED SEPT. 3. [920 1,364,374 Patented Jan. 4, 1921.

UNITED STATES E AFEZNT OFFICE.

FREDERICK JOHN HOLDER, OF DEPTFORD, AND HARRY .STEWARD, 0F HARLESDEN,ENGLAND, ASSTGNORS OF ONE-HALF 'IO 'WILLIAM ARTHUR THORNTON, OF KENLSINGTON, ENGLAND.

INTERNAL-COMBUSTION MOTOR WITH SLIDE-VALVE ACTION.

Application filed September 3, 1920.

T 0 all whom it may concern:

Be it known that we, FREDERICK JOHN HOLDER, of 19 Trundleys Road,Deptford, S. E. 8, in the county of Surrey, England, and TTARRY S'mwann,of 32 Glynlield Road, Harlesden, l WV. 10, in the county of Middlesex,England, have invented new and useful Improvements in or Relating toInternal-Combustion Motors with Slide-Valve Action, of which thefollowing is a specification.

This invention relates to improvements in internal combustion motorswith slide valve action, and it has particular reference to that form ortype of engine or motor which has been provided with reciprocating slidevalves of a crescent (convene-concave) shape,-or slightly departing fromthe crescent and in which the sharp edges of their front faces have beenremoved.

In the drawings hereunto annexed Figure 1 is a part front and partsectional elevation of four cylinders of an engine constructed accordingto this invention;

Fig. 2 is a sectional elevation on line A, B, Fig. 1; I

Fig. 3 is a part sectional plan on line C, D, Fig. 1;

Fig. l is an enlarged plan of the inlet and exhaust ports;

Fig. 5 is'a sectional elevation on line E, F, Fig. 4:;

Fig. 6 is a sectional elevation on line G, H, Fig. t;

Fig. 7 is an enlarged elevation of the slide valve and connecting rodshown at Figs. 1 and 2;

Fig. 8 is an elevation of the same drawn at a right angle to Fig. 7;

Fig. 9 is a plan of Fig. 8;

Fig. 10 is an enlarged part elevation of a modification of the means foradjusting the valve shown at Figs. 7 and 8,

Fig. 11 a plan of same;

Fig. 12 a plan of the valve without the connecting rod;

Fig. 13 a part elevation of the connecting rod for use with valves shownat Fig. 11;

Fig. 14 is an enlarged part sectional elevation of a valve showing themeans for lubricating its back.

Like parts in all the views are marked with similar letters ofreference.

Specification of Letters Patent.

Patented Jan. 4, 1921.

Serial No. 408,014.

r llthough in the drawings atFig. 1 four cyllnders are shown we wouldhave it dist nctly understood that our invention is not lnnited to thatnumber but may be applied to one, two, three. four or more cylinderengines.

a is the cylinder, Z) the cover for same, 0, d water jackets, thepiston, f the'connecting rod, 9 the cranks, it the crank shaft, 2' thecaSmg and j, j the hollow castings or covers respectively over the inletand exhaust ports of the engine, and provided with a flanged outlet k. i

All the above parts are of the usual and ordinary construction exceptthe construction of the valves and the means for retaining them in theirworking position.

The cylinder orv cylinders a is or are also fixed to the casing t in theusual and ordinary manner. The inlet and exhaust ports Z and m may be ofthe same or different sizes or areas, but in the drawings they are shownof about the same area.

In each cylinder are formed two vertical grooves 71, one of such groovesa is shown without a valve therein at Fig. 3. In the drawings althoughtwo of such grooves a are shown for each cylinder, we would have itunderstood this number may be varied as circumstances require. Insteadof making these grooves with parallel longitudinal and inclined edges asis usually the case the edges of the said grooves are undercut to form akind of a dovetail, as shown at 0, Fig. 8, for the reception of aconvexo-concave-shaped valve p made of the same thickness of metal incross section and provided with edges 9 inclined to fit and slide freelyin the grooves 11,, and being wider at the back than at the front; afeature of this invention being to obtain an equal distribution of themetal and heat, and at the same time by inclining the edges of thegroove a and valves 1? as described the latter will not fall out ofposition into the path of reciprocation of the piston 6 should thecylinder be tilted or moved out of its working position.

The front face 39 of each valve 10 is curved to fit, and to be incontact with the piston e. The length of the valve will be determined bythe position and size of the inlet and exhaust ports Z and m and thegrooves or recesses n which are formed in the cylinder are made toextend the full length of the cylinder and to be parallel with its.axis.By inclining the edges 9 of the valve as described not only are theyprevented from falling out of their working position but also the sharpfront thin edges of the crescent shaped valves, or valves composed offiat instead of curved surfaces and edges tapering and receding from theface of the valve which is in contact with the piston are dispensedwith.

When the inlet port Z is made smaller in size than the exhaust port m,then the valves 10, for standardization purposes, may be of the samesize, in which case the valves will overlap the sides of their ports Zmore than the sides of the valves used for the exhaust ports m, or whenpreferred, the said valves may be made of different sizes so as toequally overlap the sides of the said ports.

In the drawings means are shown for adjusting and varying the stroke ormovement of the valves 2 so as to make it possible to convert a lowcompression engine into a high compression engine as well as enablingany required indicator diagram to be obtained. In the drawings twomethods of obtaining this object are shown.

At Figs. 7 to 9 the projection r is cast or otherwise fixed to the backof the valves and in this lug or projection r is mounted a fixing s inthe shape of an eye bolt.

On the stem of the fixing s is cut a fine gas or other thread, say, forexample, but not necessarily so, a twenty-six fine gas thread upon whichare mounted the lock nuts 15, t which respectively work against theupper and lower surfaces of the lug or projection 1". One end of thefixing s is bifurcated at 81 for receiving the end of the connecting rod14, the opposite end of the said rod being connected to one of thecranks 4; formed on the smaller and second crank shaft w which isemployed for operating the valves.

It will readily be understood that two crank shafts w are required foreach cylinder and that they are mounted opposite to, and parallel with,each other, as shown at Fig. 2. In order to provide for thereciprocation of the valves and for the passage of the said lugs orprojections 1", openings a: are provided in the lower portion of eachcylinder.

The inner end of the connecting rod a is shown attached to thebifurcated end a by means of a pin y upon which are mounted the locknuts 2, as shown at Fig. 7.

At Figs. 10 to 13 is shown a modification of the means for adjusting themovement of the valve 3) in which, in addition to the fixed projection7*, there is a sliding piece 1 adapted to slide in guides 2 formed on,or fixed to, the back of a valve 19. In this instance the projection 1'acts as a stop and also as a guide for the screw spindle 8 provided witha collar 8 The upper end of the screw threaded spindle s is arranged topass through the block 1 and to be secured in position by means of thenut 3. Lock nuts 4, a, are also provided for securing the sliding block1 in its adjusted position. In this arrangement the connecting rod itprovided with a bifurcated end is attached to a projection 5 from thesliding block instead of to the block The sliding block 1 and the edgesof the guides 2 are undercut or inclined, as shown at Fig. 12, for thepurpose of retaining the sliding block in its working position.

The requisite motion for reciprocating the valves 19 is imparted fromthe driving shaft it through spur wheel or pinion 9 thence to the largerspur wheels 8 and 10 when the spur wheel 8 drives spur wheel '7 which isconnected to the magneto,not shown in the drawings.

As an additional means for adjusting the reciprocating movement of thevalves after adjustment by means of the line thread screw 8, movablepieces 11,-which vary in thickness,may be inserted under the lowerflange of the cylinders. These packings will vary in thickness inaccordance with the adjustment of the movement that is required.

WVith the above described sliding valves may also be used any suitablemeans for lubricating them at each upward stroke of the piston andsplashing of the oil, as, for example, a number of holes 12 are drilledor otherwise formed in the center of the valve. The said holes areinclined in a downward direction at any suitable angle,- 105 say, butnot necessarily so, forty degrees, to the face of the valve, and thesaid holes are arranged to communicate with oil-ways 13 formed on theback of the valves. These oil-ways are made in any suitable shape, 110such as, for example, say, in the angular form shown at Fig. 8, or in asemi-circular form, or of a number of diamonds separate from, or joinedtogether that will distribute the oil or other lubricant over thesurface 115 of the back of the valve and on to the inclined walls 0 ofthe recesses n or of the guides 2 when the latter are used.

The oil in the casing 71 is thrown up on the splash principle by thecrank on to the cesses with undercut edges formed in its inner surface,a plurality of disconnected, independently movable slide valves eachconsisting of a plate, of uniform thickness and convexo-concave crosssection, fitting and sliding freely in one of said recesses, thelongitudinal edges of each valve plate being inclined to correspond tothe undercut edges of the recess to prevent the valve from falling outof working position, and means for reciprocating the valves, as setforth.

2. In an explosion motor, the combination of a cylinder having aplurality of longitudinal recesses, each provided with undercut edges,formed therein, a slide valve consisting of a plate of uniform thicknessand of convexo-concave .cross section sliding freely in each of saidrecesses, the edges of each said plate being shaped to conform to theedges of the recess in which it is arranged to prevent lateral movementof the valve from working position, means for reciprocating the valves,and means for effecting independent adjustment of each valve relative tothe reciprocating means.

3. In an explosion motor, the combination of a cylinder having inlet andexhaust ports formed therein, a pair of longitudinal recesses formed inthe cylinder and having undercut edges, a convex'o-concave shaped slidevalve of uniform thickness arranged to slide freely in each recess, theedges of each valve being inclined to correspond to the edges of therecess to prevent them falling out of working position, means forreciprocating the valves, and means for adjusting the position of eitherof the valves relative to the reciprocating means independently of theother valve.

4:. The combination of a water-jacketed cylinder having verticalrecesses formed therein having undercut edges, and inlet and exhaustports, convexo-concave shaped valves of uniform thickness and havinginclined longitudinal edges to fit the said recesses, a fixed andadjustable block on the convex portion of each valve, guides for theadjustable block, a screw threaded spindle having lock nuts thereon foradjusting the block, means for imparting a reciprocating motion to thevalves, and for lubricating the same, as set forth.

FREDERICK JOHN HOLDER. HARRY STEWARD.

Witnesses:

JosnrH PASIELA, EDITH BRUCE.

